Magnavox CDB 650 Tray Drive Belt Replacement

Well I don't know what a CDB 650 is, but if the belt is under 2" long, I tend to use rubber O-rings. The hardware store will have an assortment at $.10 each. If you find the right length but want a square cross section, sells bags of 100 o-rings of round or square cross section. You can measure by looping a string around it and marking the crossing point with a sharpie or felt marker.